I know I've posted this site before: School Bully OnLine provides insight and answers for dealing with school bullying
Myths about child bullying, school bullying, school phobia, no blame etc
School bullies and bullying at school
Behaviour of the serial bully: attention seeker, wannabe, guru and sociopath including industrial psychopath, corporate psychopath and workplace psychopath
Best site I've found yet on the subject.